Mapping analyser for splitting string in Elastic search - elasticsearch

Question

is it possible to create a mapping analyser for splitting string into smaller parts based on count of characters?
For example, let's say I have a string: "ABCD1E2F34". This is some token constructed from multiple smaller codes and I want to break it down to those codes again.
If I know for sure that:
- First code is always 4 letters ("ABCD")
- Second is 3 letters ("1E2")
- Third is 1 letter ("F")
- Fourth is 2 letters ("34")
Can I create a mapping analyser for a field that will map the string like this? If I set the field "bigCode" to have value "ABCD1E2F34" I will be able to access it like this:
bigCode.full ("ABCD1E2F34")
bigCode.first ("ABCD")
bigCode.second ("1E2")
...
Thanks a lot!

Answer 1

What do you think about Pattern tokenizer? I create a regex to split string to tokens which is (?<=(^\\w{4}))|(?<=^\\w{4}(\\w{3}))|(?<=^\\w{4}\\w{3}(\\w{1}))|(?<=^\\w{4}\\w{3}\\w{1}(\\w{2})). After that I created an analyzer like that:
PUT /myindex
{
"settings": {
"analysis": {
"analyzer": {
"codeanalyzer": {
"type": "pattern",
"pattern":"(?<=(^\\w{4}))|(?<=^\\w{4}(\\w{3}))|(?<=^\\w{4}\\w{3}(\\w{1}))|(?<=^\\w{4}\\w{3}\\w{1}(\\w{2}))"
}
}
}
}
}
POST /myindex/_analyze?analyzer=codeanalyzer&text=ABCD1E2F34
And the result is tokenized data:
{
"tokens": [
{
"token": "abcd",
"start_offset": 0,
"end_offset": 4,
"type": "word",
"position": 0
},
{
"token": "1e2",
"start_offset": 4,
"end_offset": 7,
"type": "word",
"position": 1
},
{
"token": "f",
"start_offset": 7,
"end_offset": 8,
"type": "word",
"position": 2
},
{
"token": "34",
"start_offset": 8,
"end_offset": 10,
"type": "word",
"position": 3
}
]
}
You can check the documentation also : https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-pattern-tokenizer.html